NET (LOSS) INCOME PER SHARE (Basic and Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic net income per share:
Net (loss) income	$ 14,980	$ (31,881)	$ 12,020	$ 11,732	$ 20,405	$ 8,990	$ 4,282	$ 2,618	$ 6,851	$ 36,295	$ 22,027
Loss from discontinued operations, net of tax									(10,370)	(2,291)	(43,094)
Net (loss) income	$ 14,980	$ (31,881)	$ 4,998	$ 8,384	$ 17,166	$ 9,807	$ 4,825	$ 2,206	$ (3,519)	$ 34,004	$ (21,067)
Weighted average common shares outstanding									34,495	32,432	28,416
Basic net income per common share from continuing operations	$ 0.41	$ (0.90)	$ 0.36	$ 0.36	$ 0.63	$ 0.28	$ 0.13	$ 0.08	$ 0.20	$ 1.12	$ 0.78
Basic net loss per common share from discontinued operations									(0.30)	(0.07)	(1.52)
Net (loss) income per share - basic	$ 0.41	$ (0.90)	$ 0.15	$ 0.26	$ 0.53	$ 0.30	$ 0.15	$ 0.07	$ (0.10)	$ 1.05	$ (0.74)
Diluted net income per share:
Net (loss) income	$ 14,980	$ (31,881)	$ 12,020	$ 11,732	$ 20,405	$ 8,990	$ 4,282	$ 2,618	$ 6,851	$ 36,295	$ 22,027
Loss from discontinued operations (net of tax benefit)									(10,370)	(2,291)	(43,094)
Net (loss) income	$ 14,980	$ (31,881)	$ 4,998	$ 8,384	$ 17,166	$ 9,807	$ 4,825	$ 2,206	$ (3,519)	$ 34,004	$ (21,067)
Weighted average common shares outstanding									34,495	32,432	28,416
Effect of dilutive securities:
2016 Convertible notes									461
Stock options and restricted stock (in shares)									721	528	386
Weighted average common shares for diluted earnings per share (in shares)									35,677	32,960	28,802
Diluted net income per common share from continuing operations	$ 0.39	$ (0.90)	$ 0.35	$ 0.35	$ 0.62	$ 0.27	$ 0.13	$ 0.08	$ 0.19	$ 1.10	$ 0.76
Diluted net loss per common share from discontinued operations									(0.29)	(0.07)	(1.50)
Net (loss) income per share - diluted	$ 0.39	$ (0.90)	$ 0.15	$ 0.25	$ 0.52	$ 0.30	$ 0.15	$ 0.07	$ (0.10)	$ 1.03	$ (0.74)